Enjoy Wireless Audio - 2 in 1 BT 5.4 wireless receiver & transmitter. Receive/Transmit, One Click Switching. Kind reminder: When using the receive and transmit functions, you can only choose between two options. Receiving Mode - Connect to speakers, receive bluetooth signals, and wirelessly. When the receiving mode, the indicator light is blue. Transmit Mode - Connect the audio output port of the device and wirelessly through paired wireless headphones and Bluetooth speakers. Long battery life with built-in battery - Built in 200mAh rechargeable lithium battery, Type-c interface for charging, real-time battery display,and durability. Receiving mode: New Experience of Wired to Wireless Music - Connect to wired speakers, break space limitations, and enjoy wireless fun. Handsfree Call, Freeing Hands - Built in microphone for clear communication, keep hands off the steering wheel for driving. Make the car equipped with Bluetooth,wireless connection, and enjoy mobile music, voice calls, navigation playback, making driving . Transmit Mode: Connect game consoles such as for Switch/for to wireless Bluetooth, wired headphones, and enjoy wireless fun. Wireless connection makes flight easier, No wired earphone restrictions, making travel more convenient. Connect wireless headphones for and easier running. Colour:Black Material:Plastic Package Contents: 1 * Bluetooth Audio Receiver Transmitter 1 * USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.